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From: Zang Hongyong <zanghongyong@huawei.com>
To: Sasha Levin <levinsasha928@gmail.com>
Cc: linux-kernel@vger.kernel.org, mst@redhat.com,
	kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
	netdev@vger.kernel.org, xiaowei.yang@huawei.com,
	hanweidong@huawei.com, wusongwei@huawei.com
Subject: Re: [PATCH 0/2] vhot-net: Use kvm_memslots instead of vhost_memory to translate GPA to HVA
Date: Fri, 16 Dec 2011 15:40:01 +0800	[thread overview]
Message-ID: <4EEAF5D1.2080805@huawei.com> (raw)
In-Reply-To: <1324019151.4496.9.camel@lappy>

于 2011/12/16,星期五 15:05, Sasha Levin 写道:
> On Fri, 2011-12-16 at 13:32 +0800, zanghongyong@huawei.com wrote:
>> From: Hongyong Zang<zanghongyong@huawei.com>
>>
>> Vhost-net uses its own vhost_memory, which results from user space (qemu) info,
>> to translate GPA to HVA. Since kernel's kvm structure already maintains the
>> address relationship in its member *kvm_memslots*, these patches use kernel's
>> kvm_memslots directly without the need of initialization and maintenance of
>> vhost_memory.
> Conceptually, vhost isn't aware of KVM - it's just a driver which moves
> data from vq to a tap device and back. You can't simply add KVM specific
> code into vhost.
>
> Whats the performance benefit?
>
But vhost-net is only used in virtualization situation. vhost_memory is 
maintained
by user space qemu.
In this way, the memory relationship can be accquired from kernel 
without the
need of maintainence of vhost_memory from qemu.

  reply	other threads:[~2011-12-16  7:40 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-12-16  5:32 [PATCH 0/2] vhot-net: Use kvm_memslots instead of vhost_memory to translate GPA to HVA zanghongyong
2011-12-16  5:32 ` [PATCH 1/2] kvm: Introduce get_kvm_from_task zanghongyong
2011-12-16  5:32 ` zanghongyong
2011-12-16  5:32 ` [PATCH 2/2] vhost-net: Use kvm_memslots for address translation zanghongyong
2011-12-16  5:32 ` zanghongyong
2011-12-16  7:05 ` [PATCH 0/2] vhot-net: Use kvm_memslots instead of vhost_memory to translate GPA to HVA Takuya Yoshikawa
2011-12-16  7:05   ` Takuya Yoshikawa
2011-12-16  7:05 ` Sasha Levin
2011-12-16  7:05   ` Sasha Levin
2011-12-16  7:40   ` Zang Hongyong [this message]
2011-12-16  7:59     ` Sasha Levin
2011-12-16  7:59       ` Sasha Levin
2011-12-16  8:07       ` Sasha Levin
2011-12-16  8:07         ` Sasha Levin
2011-12-16  8:18       ` Zang Hongyong
2011-12-16  8:18       ` Zang Hongyong
2011-12-16  7:40   ` Zang Hongyong
  -- strict thread matches above, loose matches on Subject: below --
2011-12-16  5:32 zanghongyong

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